Answer:
a. -0.5
b. 5
Explanation:
**Part a: Find the mean of his transactions**
The mean of a set of numbers is calculated by adding all the numbers together and then dividing by the quantity of numbers.
Let's first add all the transactions together:
+10 + (-11) + (-7) + 4 + 7 + (-15) + 6 + (-9) + 11 + 9
This simplifies to:
-11 + -7 - 15 - 9 + 10 + 4 + 7 + 6 + 11 + 9
Which equals:
-5
There are 10 transactions in total, so to find the mean, we divide the sum by the quantity:
-5 / 10 = -0.5
So, the mean of his transactions is -0.5.
**Part b: Find the median of his transactions**
The median is the middle value in a list of numbers.
First, let's order the transactions from least to greatest:
-15, -11, -9, -7, 4, 6, 7, 9, 10, 11
Since there are 10 numbers (an even quantity), the median will be the average of the 5th and 6th numbers.
Looking at the list, the 5th number is 4 and the 6th number is 6.
To find the median, we calculate the average of these two numbers by adding them together and dividing by 2:
(4 + 6) / 2 = 5
So, the median of his transactions is 5.
Hope this helps! :)